About nine months ago vaux stealer said I had probs with the famous inlet manifold, and would cost £1100 to fix, i ignored a this and carried on drivng, for 6 months no probs,no eml nothing...then whenever i hit 1500 revs the car felt like it was stuttering , its ok once past 1500 , now that has almost gome away, get the odd stutter but nothing serious..mpg isnt great,acceleration isnt as good as it used to be , had a new EGR 5k ago, swirl flap actuator bar is still connected.......any ideas...please.